## Chemistry: An Atoms-Focused Approach

Published by W. W. Norton & Company

# Chapter 2 - Atoms, Ions, and Molecules - Questions and Problems - Page 73: 67

(a) Both compounds have the same number of moles of oxygen. (b) 1 mole of N$_2$O$_4$ (c) 2 moles of CO$_2$
(a) One mole of Al$_2$O$_3$ has 3 moles of oxygen. One mole of Fe$_2$O$_3$ has 3 moles of oxygen. Therefore, both compounds have the same number of moles of oxygen. (b) One mole of SiO$_2$ has 2 moles of oxygen. One mole of N$_2$O$_4$ has 4 moles of oxygen. Therefore, 1 mole of N$_2$O$_4$ has more moles of oxygen than 1 mole of SiO$_2$. (c) Three moles of CO have 3 moles of oxygen. Two moles of CO$_2$ have 4 moles of oxygen. Therefore, 2 moles of CO$_2$ have more moles of oxygen than 3 moles of CO.